This is the avrdude command to read the eeprom:
avrdude -F -b 100000 -c linuxspi -p m8 -P /dev/spidev0.0 -U eeprom:r:dtx-142.hex:r
Hardware hacking the Ritron Radio can be done with a Raspberry Pi. If you want to dump the eeprom and flash, you can use your Raspberry Pi.

*** WARNING, ONLY USE THE 3.3V OF THE PI AND NO OTHER POWER TO THE RITRON BOARD ***